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DC DISTRIBUTION
BOARD
12Volt DC Distribution Board using 30Amp
Anderson connectors and including reverse polarity protection.
With
most of my 12v equipment standardised with Anderson connectors it has
become necessary to construct a 12Volt DC distribution board to create
some order, segregate and protect groups of supplies to various
equipment. With appropriate fuse protection and reverse polarity
protection, the compact 12Volt DC distribution board uses 30Amp
Anderson connectors mounted with snap in Anderson connector panel
housings that have two circuits per housing, each group of two
circuits is protected with a fuse of typically 15Amps, however the
fuse protection could be a lot lower depending on requirements.
Photo 1 DC Distribution Board
The
supply to the distribution board has an inline fuse of 25Amps and also
includes reverse polarity protection in the form of SUP53P06 P Channel
Mosfet that will in the advent of the supply being
inadvertently connect in reverse polarity, this will block damaging
current flow in this event.
Each fused group also has a relatively bright LED indicator light to
indicate a healthy supply to that group.
The
SUP53P06 P Channel Mosfet has a very low forward resistance at
approximately 0.02 ohms resulting in approximately a 4.5Watts loss or
a volt drop across the device of 0.3V at 15Amps. The Mosfet is also
attached to a heatsink as the potential power dissipation could exceed
the device rating of 3.1Watts.
Mosfet
details: P Channel Continuous
Drain Current Id: 53A Drain
Source Voltage Vds: -60V On
Resistance Rds(on): 0.0195ohm Rds(on)
Test Voltage Vgs: -10V Threshold
Voltage Vgs: -1V Power
Dissipation Pd: 3.1W
Fig
1 Schematic of DC distribution board
Fig
2 Voltage drop across the SUP53P06
P Channel Mosfet based load current.
Fig
3 Power dissipation by the SUP53P06
P Channel Mosfet based load current.
Construction
DC
distribution board is housed in a 170 x 120 x 55mm polycarbonate
enclosure with Anderson connectors mounted with snap in Anderson
connector panel housings mounted in the rear and with fuse and
indicator LED mounted at the front.
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DESCRIPTION
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QTY
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CONNECTOR
- ANDERSON POWER POLE 30A CONNECTOR ASSY
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6
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CONNECTOR
- ANDERSON POWER POLE 30A CONNECTOR PANEL HOUSING
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3
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SUP53P06-20 MOSFET P-Ch 60V/53A
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1
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DIODE, ZENER 10V, 1N4740, 1WATT
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1
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LED
MOUNTING CLIPS, 5mm, BLACK
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3
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RESISTOR, 1.0k, 0.25W
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3
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RESISTOR, 10k, 0.25W
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1
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WIRE, COPPER, PVC, 2 CORE, 2.90mm2, 25A, RED & BLACK
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2
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ENCLOSURE,
SEALED POLYCARBONATE, 170 x 120 x 55mm
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1
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FUSE
AUTO, 3AG, 15.0AMP, GLASS
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3
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FUSE
AUTO, 3AG, 25.0AMP, GLASS
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1
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FUSE
HOLDER, BULKHEAD MOUNTED,
30A MAX 50V, TYPE 3AG
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3
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FUSE
HOLDER, INLINE, AUTO, MAX 30AMP
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1
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Photo
2 Anderson connector
panel housings cut out.
Photo
3 DC Distribution Board top cover off view.
Photo
4 DC Distribution Board front cover off view.
Photo
5 DC Distribution Board rear cover off view.
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last revised 05 May, 2025
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